Since Howard the Duck has been invoked quite a few times, I have to address him. He never has struck me as silly. Anyone who read his comics way back when, especially in the early days, would likely agree. It was the situations he found himself forced into that were silly - surreal, in many cases - but even he acknowledged how bizarre his predicamant was. He was, as the blurb on his comic said, "trapped in a world he never made." He was, essentially, a normal guy somehow thrust through to a parallel universe where "hairless apes" ran everything, a situation which he felt was as ridiculous as talking ducks are to us. That's why I have a hard time getting why people seem so adamant about not having ducks in a game. I don't think of Donald or Daffy in the context of this discussion, so maybe that's where the difference lies.